Mahlon brookfield



M. BROOKFIELD. LET-OFP MEGHANISM FOR LOOMS.

Patented Apr. 9, 1867.

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IMPROVEMENT IN LET-OFP MCHANISM FOR. LDOMS..`

digi tlgchnle nfarri tu iu this trttas atfut mit mating pim nf the timeTO4 ALL WHOM; IT MAY CONCERN: Y v

Be it known that I, MAHLON BROOKFIELmof Brookfield, in the county ofClinton, and State of liowa, have invented a' new and improved Let-0iMechanism for Looms; and I do hereby declare `the following to be afull, clear,and exact description of the same, sniicient to enable oneskilled in the art towhich the invention appara 4.tnins to make use ofit, reference being had-'to the accompanying drawings, which formapai-tof thisspecifi* cation, and in which my invention is represented bya froztelevation;

o This-is an adjustable arrangement for attachment -to the yarn-beam ofa loom to graduate the traction 4of the bund in proportion to thequantity o'f yarn 4upon the beam. An e'ven tension is required upon thelyarn as it is paid off the beam, and the power. of the yarn under agiven strain to revolve a full beam is much'. greater than when it iscomparatively empty. v,A weighted 'and graduated scale-beam is attachedto the end of the friction-band, the weight-carrier 4travelling on afeed-screw as the yarn-beam revolves. -A cervt'nin pijoportionisinstituted between the range ofthewcight-carrier'on th feed-screw andthe radial capacity of' the yarn-beam, and changeable gears connectingthe two` yury their Arelative speed.

l A -quantity ,of ya'rnj being wound upon the beam, and the number' of"revolutions counted, the radial thicknessnf the yarn on thebbamlismeasured, andfrom these tinta the proper-initial position of the weightis found, so' that' it` will reach` zero on the scale when theyarn-beam, is empty., The scale is graduated-with verticallines which todefinite proportions of radial capacityof:the--yarn-beamand'witlihorizontal lines, whose numerals are calculatedfordiii'erent sets ofgearing indieatedin the leftslinnd column as Nos. 1`to 8.

In country places,;especially', alimited quaiitity'of warpis4freqnentlyplaced'fon'the beam, su'iiicient foi a 'given qu'antitybfclbth, or more often acci-tain quantity of yarn isii'rjnishedoth'c'weaver to mnkens much cloth4 as it will. The quantityvof cloth froma given weight vof'warp will depend to some extent on the size oi thewarp. p -i p u 4 y :The zero point on thelseal'e-beam represents the-surface f of the empty yarn-beam, andithe outermost range of the weightat the' lend of the yarn-beam corresponds to the last-,coil of the warpwhen the beam is filled to its capacity. These zero and ultimate pointsare true in all cases, whatever may be the size of the warp. It will beapparent that if "the beam bewoun'd'fullV with coarse warp, that, inunwinding, :it will not revolve as many times as it would were it filledlinstead with fine warp and similarly unwound The change able gearing atthe `point of connection between .the yarn-beam and the feed-screw isadapted to perform thereqnired adjustment. 'The numberof varictiesof'yarn being taken :ts-eight, an equal number of sets p of gearing will berequired te adapt' the let-oifmech'anism toA these varying qualities o'fwarp.. v

If the weaver were exactly acquainted with the warp he was about to windvupon the beam, and the hygrometric changes were insignificant, and theproper' gearing were at the point of connection afterwinding upon thebeam to any given proportion of its radial capacity, saytwo-thirds, hemight put the weight-carrier twothirds out from the zero peint on thescale', which would adapt it to reach the zeo` point as the lasteoilcam-e 'off from the yarn beam; but in the case Iam' abouttoinstn'lnce, the proper place of the weight' cannot, be so readilyestimated. V p

I will suppose a. quantity of warp of c ven,'but, unknown size,'andquantity not stated', to lbe presented "tofrthe weaver. This, properlyprepared, iswound'upon the beam, andthe number of revolutions counted,say

one hundred and eighty. The yextent'to which it fills the radialcapacity ofthe yarnbeam isnote, say twthirds, which, in a common loom,will be four inches. The figure 12in the upper line ofthe scale willindicate -.twothirds of the range of the weight on the feed screw; andbeneath the ligure, on looking forlSO, I find itin the second column. Icarry my eye to the left, and in` the left-hand columnl find the gure 2,which indicates that I take gears No. 2, by which fifteen (next column)revolutions of the warp-beam produce one inch of,rectilinear motion ofthe weight-carrier`on thefeedlscrew.

I have given a fair description of themachinef'asarranged for a givenproportion of parts. It is, of course, capablcof arrangement to suitvarying needs, where the relative sizes of -the core' of the yarn-rollerand the full roller are different to those just stated. t,

It will not he diincult, 'fremth'e proportions I have stated and theexplanations afforded, to adapt the peculiar features of my improvementto the varying necessities of a given case.

In the drawings, A. A are the uprights of the loom frame, B tlie base. Cis the warp-beam, which revolve 'j :i in bearings in ythe uprights A. Dis a drum upon the warp-beamC. The strap E passes over the drum D, is-

seeured behind to a, bar of the frame, and, in front, forms thesuspension point of the scale-beam The latter has its inner fulcrum bythe contact ofA the lugs c with brackets d on the posts G. The beam Fisgraduated as has been formerly described, and a certain proportionisi-maintained between it Iand the diameter of thel yarn-beam.Inthe'drawing, the. drum D is supposed to'hove a radial width of sixinches outside of thecentral shaft or core: The thiclcnessxoi` thecentral shaft is represented by the blank lportion of the scalebea.m,and the graduated portion represents the six inches of radial capacityfor warp of the beam. H is a feed-screw, which, in practice,

-may conveniently have fourteen threads to the inch, and it is connectedby gimbal-jont' with n shaft, I, and

gearing having, say,.twentyfour cogs in each wheel,-and a shaft, J, andgear-wheels of similar character connecting it to the warp beam. y Asthus set, a certain quality of warp, say No. 1, will, in unwindingfourteen revolutions, move the weight carrier Lone inch, that is,one-eihteenth of its range, the'eighteen vertical divisions representinginches. Two more cogs in the wheel z' will make it revolve a. littleslower,and so on of' the rest. The slower the Ascrew revolves relativelyto the warp-beam the greater number of revolutions, of

course, are required to move the weight-carrier a single inch; so' that,with the No. 8 wheels, it takes twentytwo revolutions of the warpbeam tomove the weight-carrier one inch, and three h'undred and ninety-sixrevo- *lutions, the capacity of the-beam with ythis warp -tomove theweight-carrier from the one end of the scale to the other,l the fulltothel empty conditions of 'the' warp-beam'.l @he friction-straprE' maybe adj usted 'in lengt-h by n take-up-'device inthe rear. The universaljoint will permit considerable latitudeof motion without actualdisarrangement. The-weight may be increased or diminishedvl as thetension may require, according to the'tractive 'character of the leatherband, `butnvhen arranged, it gives an even action for the Wholc'lengthof itsmnge.

Having described iny invention, what Ir claim as new, and desire tosecure by Lctt'ers Patent, is-- The graduated scale-beam F, combinedwith a feed-screw, H, and weight, suspended from' a friction-strapcrdevice on the warp-beam, and to be used in connection with differentsets or speeds of ,fe'arsi', substantially as described and represented.

Toithc above specification-I havc signed my hand this 15th of January,1867. v MAHLON BROOKFIELD,

Witnesses:

EDWARD- H. KNIGHT, l Seton' C. KEMON'.

